Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6232d3a26cac69…

MALICIOUS

PDF

74.0 KB Created: 2021-06-13 16:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b2598bed02b921e4ba19a08f846ca6fa SHA-1: ab525c205298d43343c9d691c0a773616ea45e9d SHA-256: 1b6232d3a26cac696779f3fa5960bd895149595690bc1fa98d9bfa698a251c37
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document impersonates a cloud file-sharing service, a common lure for phishing or malware downloads. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to distribute malicious payloads or redirect users to phishing sites. No scripts were extracted, but the overall structure and embedded URLs strongly suggest a malicious download or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=planswift+tutorial+pdf+free+download PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f03375710---55969441902.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/9a316d03f04eebfe01126a4af98f4152/15750677026.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/887c61fc183ec31451c54019ae4ed636/97413246678.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/kevefo.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/nunofuvokadi.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/85109241017.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/17211612798.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/bc240293aebedd68cf313cd2a1c0568b/34096032124.pdfIn PDF document text
    • http://arablift.net/userfiles/file/75061204215.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/11892045283.pdfIn PDF document text
    • http://teplospectr.ru/images/files/fafesinizurej.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16083a2bbad9ae---jabepegiduzo.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d7f8c81c4024b89ba2492cf039b1bdd7/pofaviv.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/46774257102.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8bfa452bc5481592661f6b0219f0d1bd/81914050638.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/dalodotuv.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e602a971a---40559218298.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 5128 bytes
SHA-256: 549c39d89afd7a7c1ff956563f7896cd5babe02daf904bc21a84a3716bc3c9bd
font_01_sfnt_off0000f6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 10520 bytes
SHA-256: 8b836ecfd3eca9fee2f2fabc1cce8adc2e4737dd38892d9d3c91e2905d67ed5f

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